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Finding the Fourth Proportional to 76.28, 105.18 and 59.90

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Solution

The fourth proportional to 76.28, 105.18 and 59.90 is: 82.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.28 : 105.18 = 59.90 : x
  2. Step 2: Convert to fraction form
    76.28/105.18 = 59.90/x
  3. Step 3: Cross multiply
    76.28x = 105.18 × 59.90
  4. Step 4: Simplify right side
    76.28x = 6,299.76
  5. Step 5: Solve for x
    x = 6,299.76/76.28
  6. Step 6: Final answer
    x = 82.59

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.